WO2023120002A1 - Shock absorber - Google Patents

Shock absorber Download PDF

Info

Publication number
WO2023120002A1
WO2023120002A1 PCT/JP2022/043111 JP2022043111W WO2023120002A1 WO 2023120002 A1 WO2023120002 A1 WO 2023120002A1 JP 2022043111 W JP2022043111 W JP 2022043111W WO 2023120002 A1 WO2023120002 A1 WO 2023120002A1
Authority
WO
WIPO (PCT)
Prior art keywords
outer shell
clamping pieces
clamping
shock absorber
pieces
Prior art date
Application number
PCT/JP2022/043111
Other languages
French (fr)
Japanese (ja)
Inventor
良樹 松岡
久輔 土田
Original Assignee
Ｋｙｂ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｋｙｂ株式会社 filed Critical Ｋｙｂ株式会社
Publication of WO2023120002A1 publication Critical patent/WO2023120002A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
    • B60G13/02—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally
    • B60G13/06—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G7/00—Pivoted suspension arms; Accessories thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/54—Arrangements for attachment

Definitions

  • the present invention relates to buffers.
  • the shock absorber includes an outer shell and a rod that is movably inserted into the outer shell, and is used, for example, by being incorporated in a suspension in a vehicle, and when the piston rod moves axially with respect to the outer shell, the shock absorber expands and contracts.
  • the damping force is exerted to suppress the vibration of the vehicle body and wheels.
  • a shock absorber built into a suspension in this way for example, when used in a strut-type suspension, has a knuckle bracket attached by welding to the lower end of the outer shell for attaching a knuckle that holds the wheel of the vehicle.
  • the knuckle bracket includes a pair of curved tube contact portions that contact the outer periphery of the outer shell, and a diameter of the outer shell extending from the circumferential end of each tube contact portion.
  • a pair of knuckle mounting portions that extend in parallel to each other in a direction and can be connected to the knuckles, and a connecting portion that connects the upper ends of the respective mounting portions are provided (see, for example, FIG. 6 of Patent Document 1). ).
  • the inner peripheral surface of the tube contact portion of the knuckle bracket that contacts the outer shell and the side surface of the connecting portion that contacts the outer shell are arranged outside the outer shell so that they follow the outer periphery of the outer shell. It has a curved surface with the same curvature as the curvature of the diameter.
  • the inner peripheral surface of the tube contact portion and the side surface of the connecting portion are in tight contact with the outer periphery of the outer shell, and the lower end of the tube contact portion is The periphery of the tube abutting portion and connecting portion is welded to the outer shell to fix the knuckle bracket to the outer shell.
  • an object of the present invention is to provide a shock absorber capable of improving and stabilizing the welding quality at the welded portion between the outer shell and the knuckle bracket.
  • the shock absorber of the present invention comprises a shock absorber main body having a cylindrical outer shell, a rod movably inserted into the outer shell, and a knuckle bracket attached to the outer circumference of the lower end of the outer shell.
  • the knuckle bracket includes a pair of clamping pieces curved along the outer periphery of the outer shell and clamping the outer shell, and radial ends of the clamping pieces extending in the radial direction of the outer shell to face each other. and a connecting piece for connecting the ends of the mounting pieces, and the base end side of the inner peripheral surface of each clamping piece contacts the outer periphery of the outer shell rather than the distal end in the circumferential direction.
  • the shock absorber configured in this way, when the outer shell is inserted between the clamping pieces from the side, the outer shell enters between the clamping pieces without being caught by the ends of the clamping pieces in the circumferential direction, and is pushed into the inner periphery of the clamping pieces. In the circumferential direction of the surface, it is stably supported by abutting on two points on the base end side excluding the tip end, and an excessively large gap is formed between the inner peripheral surface of the clamping piece and the side surface of the connecting piece and the outer shell. never occur.
  • FIG. 1 is a side view of a shock absorber in one embodiment.
  • FIG. 2 is a front view of the knuckle bracket of the shock absorber in one embodiment.
  • FIG. 3 is a side view of the knuckle bracket of the shock absorber in one embodiment.
  • FIG. 4 is a plan view of the knuckle bracket of the shock absorber in one embodiment.
  • FIG. 5 is a plan view of the knuckle bracket attached to the shock absorber in one embodiment.
  • FIG. 6(a) is a flat plate punched into a shape in which the knuckle bracket is developed.
  • FIG. 6(b) shows a half-finished product of a knuckle bracket in which a clamping piece and an attachment piece are molded.
  • FIG. 6(c) shows a half-finished knuckle bracket after drilling bolt insertion holes in the mounting piece.
  • the shock absorber D includes a shock absorber body 1 having an outer shell 2 and a rod 3 movably inserted into the outer shell 2;
  • the knuckle bracket 4 is connected to a knuckle supporting a vehicle wheel (not shown) and interposed between the vehicle body and the wheel.
  • the shock absorber main body 1 has a cylindrical outer shell 2 and a rod 3 movably inserted into the outer shell 2, and the rod 3 moves relative to the outer shell 2 in the axial direction. At times, a damping force is generated to prevent the relative movement of the rod 3 with respect to the outer shell 2, thereby damping the vibration of the vehicle body and wheels.
  • the shock absorber body 1 includes, for example, a cylindrical outer shell 2 whose lower end is closed, a cylinder (not shown) accommodated in the outer shell 2, a rod 3 movably inserted into the cylinder, and a A piston that is connected and inserted into the cylinder to divide the inside of the cylinder into an expansion side chamber and a compression side chamber, a reservoir formed between the cylinder and the outer shell 2, and a compression side chamber provided at the lower end of the cylinder. It has a valve case that separates the reservoir.
  • the expansion side chamber and the compression side chamber are filled with liquid such as hydraulic oil, and the reservoir is filled with liquid and gas.
  • the liquid used in the buffer D may be liquid such as water or an aqueous solution other than hydraulic oil.
  • the outer shell 2 is a member forming the outermost shell of the shock absorber body 1 to which the knuckle bracket 4 is attached. It may be a covering member.
  • the shock absorber main body 1 includes a passage that communicates the expansion side chamber and the compression side chamber, and a passage that communicates the compression side chamber and the reservoir, and each passage is provided with a damping valve.
  • the shock absorber main body 1 constructed in this manner the expansion side chamber and the compression side chamber are expanded and contracted by the piston when the shock absorber main body 1 is constructed as described above, and the liquid moves through the passage. generate force.
  • a lower suspension spring bearing 16 that supports the lower end of a suspension spring (not shown) is attached to the outer circumference of the middle of the outer shell 2 .
  • a suspension spring (not shown) is interposed between the upper suspension spring bearing attached to the tip of the rod 3 and the lower suspension spring bearing 16.
  • the knuckle bracket 4 is formed by using a single metal plate as a base material, punching the base material into a shape in which the knuckle bracket 4 is developed, and then bending the base material. .
  • the knuckle bracket 4 includes a pair of clamping pieces 5 and 6 that curve along the outer periphery of the outer shell 2 and clamp the outer shell 2 , and extend from the circumferential ends of the clamping pieces 5 and 6 to the diameter of the outer shell 2 .
  • a pair of mounting pieces 7 and 8 extending in a direction and facing each other, a connecting piece 9 connecting the upper ends of the mounting pieces 7 and 8, and the clamping pieces 5 and 6, the mounting pieces 7 and 8 and the connecting piece 9 intersect. It has a pair of cutouts 10, 11 for cutting out the intersection of three faces.
  • Each of the clamping pieces 5 and 6 is a plate curved along the outer peripheral shape of the lower end of the outer shell 2 when viewed from the axial direction of the outer shell 2 .
  • the inner peripheral surface is brought into contact along the axial direction.
  • the radius of curvature of the inner peripheral surfaces of the clamping pieces 5 and 6 is larger than the radius of the outer periphery of the outer shell 2, and the center of curvature c1 of the inner peripheral surfaces of the clamping pieces 5 and 6 is arranged on a straight line S passing through the center O of the outer diameter of the outer shell 2 and the center O of the outer diameter of the outer shell 2 when viewed from the axial direction of the outer shell 2 and on the opposite side of the connecting piece from the center O. .
  • the tips of the clamping pieces 5 and 6, which are opposite to the mounting piece side ends in the circumferential direction, do not exceed half of the outer shell 2 when viewed from the axial direction of the outer shell 2.
  • the knuckle bracket 4 is welded to the outer periphery of the outer shell 2.
  • the knuckle bracket 4 can be approached from the side of the outer shell 2, which facilitates the assembly work.
  • the width W between the tips of the inner peripheral surfaces of the clamping pieces 5 and 6, which are opposite to the mounting piece side ends in the circumferential direction, is longer than the outer diameter of the outer shell 2. If the proximal side of the inner peripheral surface relative to the distal end in the circumferential direction and the proximal end side of the inner peripheral surface of the clamping piece 6 relative to the distal end in the circumferential direction are in contact with the outer periphery of the outer shell 2, the width W is , may be shorter than the outer diameter of the outer shell 2 .
  • the mounting pieces 7 and 8 extend parallel to each other in the radial direction of the outer shell 2 from the proximal ends of the clamping pieces 5 and 6 in the circumferential direction and face each other.
  • Two bolt insertion holes 7a and 8a are provided at positions that can face two holes. Then, a knuckle mounting portion (not shown) is inserted between the mounting pieces 7 and 8, and the mounting pieces 7 and 8 are secured by a bolt and nut (not shown) passing through the knuckle mounting portion inserted into the bolt insertion holes 7a and 8a.
  • the knuckle bracket 4 can be attached to the knuckle by bolting the attachment portion.
  • the lower ends of the mounting piece 7 and the clamping piece 5 and the lower ends of the mounting piece 8 and the clamping piece 6 are outwardly bent away from the outer shell 2 and provided with flange-like reinforcing ribs 12 and 13 .
  • a bulge portion 14 is provided which is cut away from the vertical center of the mounting piece 7 to the vertical center of the clamping piece 5 and bulges away from the outer shell 2 , and clamps the mounting piece 8 from the vertical center.
  • a bulge portion 15 is provided at the center of the piece 6 in the vertical direction and bulges away from the outer shell 2 .
  • Reinforcement ribs 12 and 13 and bulge portions 14 and 15 are provided to improve strength against loads that deform knuckle bracket 4 .
  • the upper ends of the mounting pieces 7 and 8 are connected by a connecting piece 9 perpendicular to the mounting pieces 7 and 8.
  • a side surface 9 a of the connecting piece 9 facing the clamping pieces 5 and 6 and facing the outer peripheral surface of the outer shell 2 is curved along the outer periphery of the outer shell 2 so that the clamping pieces 5 and 6 are attached to the outer shell 2 .
  • the connecting piece 9 When the connecting piece 9 is brought into contact with the outer periphery, the side surface 9a of the connecting piece 9 also contacts the outer periphery of the outer shell 2. As shown in FIG.
  • the knuckle bracket 4 has a box-shaped attachment pieces 7, 8 and a connecting piece 9, and has a structure in which the proximal ends of the attachment pieces 7, 8 are connected to the clamping pieces 5, 6, respectively.
  • a reference hole 9b is provided in the center of the connecting piece 9 in the horizontal direction in FIG.
  • a side surface 9a of the connecting piece 9 facing the outer shell is curved and contacts the outer periphery of the outer shell 2.
  • the radius of curvature of the side surface 9 a of the connecting piece 9 is equal to the radius of curvature of the inner peripheral surfaces of the clamping pieces 5 and 6 and larger than the radius of the outer diameter of the outer shell 2 .
  • the center of curvature c2 of the side surface 9a of the connecting piece 9 is on a straight line S passing through the center O of the outer diameter of the outer shell 2 and the center of the connecting piece 9 when the outer shell 2 is viewed from the axial direction. is located on the side opposite to the connecting piece and closer to the connecting piece than the center of curvature c1 of the inner peripheral surfaces of the clamping pieces 5 and 6. As shown in FIG.
  • the radii of curvature of the side surface 9a of the connecting piece 9 and the inner peripheral surfaces of the clamping pieces 5 and 6 are equal and larger than the radius of the outer shell 2, and the center of curvature c2 of the side surface 9a of the connecting piece 9 and the center O of the radius of the outer shell 2 and on the side opposite to the connecting piece side of the center O of the radius of the outer shell 2.
  • the center c1 is arranged on the straight line S and on the opposite side of the connecting piece from the center of curvature c2 of the side surface 9a of the connecting piece 9. As shown in FIG.
  • the radius of curvature d1 of the side surface 9a of the connecting piece 9 and the inner peripheral surfaces of the clamping pieces 5 and 6 is larger than the radius d2 of the outer shell 2, and the center of curvature c2 of the side surface 9a of the connecting piece 9 is
  • the center O of the radius of the outer shell 2 is arranged on the side opposite to the connecting piece, and the center of curvature c1 of each of the clamping pieces 5 and 6 is on the straight line S and is opposite to the center of curvature c2 of the side surface 9a of the connecting piece 9. Located on one side of the connection.
  • the knuckle bracket 4 has cutouts 10 and 11 at the upper end of the boundary between the holding piece 5 and the mounting piece 7 and the upper end of the boundary between the holding piece 6 and the mounting piece 8, respectively.
  • the notch 10 is provided so as to cut the intersection of the three surfaces of the clamping piece 5 , the mounting piece 7 and the connecting piece 9
  • the notch 11 cuts the clamping piece 6 , the mounting piece 8 and the connecting piece 9 . It is provided so as to excise the three-plane intersection point, which is the intersection point of the three planes of .
  • Each notch 10, 11 is formed by notching the base material in a rectangular shape, opening from the upper end of the boundary between the clamping pieces 5, 6, the mounting pieces 7, 8, and the connecting piece 9, and cutting the base material downward. It has chamfered portions 10a and 11a formed by chamfering in an R shape.
  • the knuckle bracket 4 configured as above is manufactured by the following procedure. First, a base material of a rectangular metal plate-like blank (not shown) is punched out to obtain a flat plate having a shape in which the knuckle bracket 4 shown in FIG. 6A is developed.
  • the reference hole 9b in the connecting piece 9 is also formed by punching out a blank base material to obtain the flat plate.
  • the reference hole 9b serves as a reference indicating the position of the center of the flat plate, and is used for positioning with respect to the processing device in bending and forming the flat plate following punching of the base material.
  • the flat plate was bent by press working, and as shown in FIG. After that, as shown in FIG. 6(c), the mounting pieces 7 and 8 are punched with bolt insertion holes 7a and 8a. 6(c), the half-finished product of the knuckle bracket 4, which has been perforated in FIG. 6(c), is bent along the broken lines in FIG. A knuckle bracket 4 can be manufactured.
  • the knuckle bracket 4 is manufactured in this manner, the two three-sided intersections of the clamping pieces 5, 6, the mounting pieces 7, 8, and the connecting piece 9 are cut off by notches 10, 11, respectively. Since the connecting piece 9 and the boundaries between the mounting pieces 7 and 8 are not connected to each other, the clamping pieces 5 and 6 are bent at the boundary between the connecting piece 9 and the mounting pieces 7 and 8. out of the way. Therefore, even the knuckle bracket 4 having a three-sided intersection with the clamping pieces 5, 6, the mounting pieces 7, 8, and the connecting piece 9 can be molded without difficulty.
  • the outer shell 2 is clamped at two points on the proximal side of the curved inner peripheral surfaces of the clamping pieces 5 and 6 from the distal ends.
  • the outer shell 2 is supported by the knuckle bracket 4 at three points in the circumferential direction.
  • the width W between the tips of the inner peripheral surfaces of the clamping pieces 5 and 6 that are opposite to the mounting piece side ends is larger than the outer diameter of the outer shell 2, when the outer shell 2 is inserted between the clamping pieces 5 and 6 from the side, , the outer shell 2 enters between the clamping pieces 5 and 6 without being caught by the distal ends of the clamping pieces 5 and 6 in the circumferential direction, and extends to the proximal end side of the inner peripheral surfaces of the clamping pieces 5 and 6 except for the distal ends in the circumferential direction. are supported in the circumferential direction by the clamping pieces 5 and 6.
  • the knuckle bracket 4 If the knuckle bracket 4 is welded to the outer shell 2 while the outer shell 2 is loose between the clamping pieces 5 and 6, the knuckle bracket 4 cannot be attached to the outer shell 2 at a proper position. In addition, it may become difficult to connect the shock absorber D to the knuckle, but the shock absorber D of this embodiment can avoid such a situation.
  • the outer shell 2 is stable in the circumferential direction with respect to the knuckle bracket 4 without forming a large gap between the outer shell 2 and the inner peripheral surfaces of the clamping pieces 5 and 6 and the side surface 9a of the connecting piece 9.
  • the knuckle bracket 4 is fixed to the outer shell 2 by welding.
  • the outer shell 2 extends from the tip of the upper end of the clamping piece 5 to the tip of the upper end of the clamping piece 6 on the opposite side via the upper side of the connecting piece 9 .
  • the tips of the clamping pieces 5 and 6 are arc-welded to the outer circumference of the outer shell 2 along the axial direction, and the knuckle bracket 4 is fixed to the outer shell 2 by welding.
  • the upper end of the clamping piece 6 on the opposite side from the vicinity of the upper end of the clamping piece 5 opposite to the mounting piece side via the upper side of the side surface of the connecting piece 9 is located on the opposite side of the clamping piece 6 .
  • a welded portion B1 is formed up to the vicinity of the end, and a linear welded portion B2 is formed along the axial direction of the outer shell 2 from the vicinity of the upper end to the vicinity of the lower end of the opposite side end of each clamping piece 5, 6. be done.
  • the welded portions B1 and B2 are formed by melting the material to be welded and the welding material of the knuckle bracket 4 and the outer shell 2, the outer shell 2 is stably supported by the knuckle bracket 4 and the outer shell 2 and the inner peripheral surfaces of the clamping pieces 5 and 6 and the side surface 9a of the connecting piece 9 do not form an excessively large gap. Therefore, the melted bead stays in the welded portions B1 and B2 and does not flow down, so that the welded portions B1 and B2 can be formed in good condition. Therefore, the welding quality between the outer shell 2 and the knuckle bracket 4 is improved and the welding quality is stabilized, and the knuckle bracket 4 is firmly fixed to the outer shell 2 .
  • a connecting piece 9 that connects the upper ends of the mounting pieces 7, 8 from the roots of the clamping pieces 5, 6 to each other. If 11 is not provided, the three-sided intersection point, which is the intersection of the three faces of the clamping pieces 5 and 6, the mounting pieces 7 and 8, and the connecting piece 9, remains on the base material. It is difficult to bend the knuckle bracket 4 at right angles, and it becomes very difficult to mold the knuckle bracket 4 .
  • the knuckle bracket 4 is provided with the cutouts 10 and 11 at which the clamping pieces 5 and 6, the mounting pieces 7 and 8, and the connecting piece 9 intersect, the cutouts 10 and 11 are cut.
  • the knuckle bracket 4 can be molded without difficulty in which the pinching pieces 5 and 6 do not interfere with the bending molding when the bending molding is performed at the boundary between the piece 9 and the mounting pieces 7 and 8. ⁇
  • the shock absorber D of this embodiment includes the shock absorber main body 1 having the cylindrical outer shell 2 and the rod 3 movably inserted into the outer shell 2 , and the lower end of the outer shell 2 .
  • a knuckle bracket 4 is attached to the outer periphery of the outer shell 2.
  • the knuckle bracket 4 is curved along the outer periphery of the outer shell 2 and sandwiches the outer shell 2 between the pair of clamping pieces 5 and 6.
  • a pair of mounting pieces 7 and 8 extending in the radial direction of the outer shell 2 and facing each other, and a connecting piece 9 connecting the ends of the mounting pieces 7 and 8 are provided.
  • the base end side of the inner peripheral surface of 6 is in contact with the outer periphery of the outer shell 2 rather than the distal end in the circumferential direction.
  • the outer shell 2 is stably supported by the knuckle bracket 4, and the inner peripheral surfaces of the outer shell 2 and the clamping pieces 5 and 6 and the connecting piece 9 are supported. Since an excessively large gap does not occur between the side surface 9a and the outer shell 2, the upper ends of the clamping pieces 5 and 6, the circumferential ends of the clamping pieces 5 and 6, the side surface 9a of the connecting piece 9, and the outer shell 2 can be welded together. Welded portions B1 and B2 having good and stable welding quality can be obtained. As described above, according to the shock absorber D of the present embodiment, it is possible to improve and stabilize the welding quality at the welded portions B1 and B2 between the outer shell 2 and the knuckle bracket 4 at the same time.
  • the distance from the inner peripheral surface of each clamping piece 5, 6 to the outer shell 2 is the contact point a1 between the inner peripheral surface of each clamping piece 5, 6 and the outer shell 2. , a2 toward the distal ends of the clamping pieces 5 and 6. As shown in FIG.
  • the shock absorber D is configured in this way, the width of the tip side of the inner peripheral surface of each of the clamping pieces 5 and 6 of the outer shell 2 becomes wider, so that the outer shell 2 can be inserted between the clamping pieces 5 and 6. is smooth, and the outer shell 2 can be stably brought into contact with the base ends of the inner peripheral surfaces of the clamping pieces 5 and 6 .
  • the outer shell 2 abuts on the inner peripheral surfaces of the clamping pieces 5 and 6 in the circumferential direction at two points on the proximal side excluding the distal ends. Since the outer shell 2 is supported by the knuckle bracket 4 at three points when it also abuts on the side surface 9a of the piece 9, the welding quality at the welded portions B1 and B2 between the outer shell 2 and the knuckle bracket 4 is further improved. and stability can be realized, and the welding strength between the connecting piece 9 and the outer shell 2 can be improved.
  • the inner peripheral surfaces of the clamping pieces 5 and 6 are curved surfaces whose curvature changes if the width W between the ends of the clamping pieces 5 and 6 in the circumferential direction is larger than the outer diameter of the outer shell 2 . may be If the inner peripheral surfaces of the clamping pieces 5 and 6 are formed so as to pass through a circle with a radius d1 centered on the center of curvature c1, the dimensional control of the knuckle bracket 4 is facilitated.
  • the knuckle bracket 4 can be firmly fixed to the outer shell 2, and the mounting pieces 7 , 8 and the connecting piece 9 form a box shape, the strength of the knuckle bracket 4 is increased to withstand the load input from the knuckle. Since the knuckle bracket 4 is provided with a pair of cutouts 10, 11 cut at the intersection of the clamping pieces 5, 6, the mounting pieces 7, 8 and the connecting piece 9, it can be firmly fixed to the outer shell 2. At the same time, a high-strength knuckle bracket 4 can be molded without difficulty.
  • the knuckle bracket 4 does not have a holding portion surrounding the outer shell 2 like the conventional knuckle bracket, the knuckle bracket 4 is smaller than the conventional knuckle bracket and requires less material for manufacturing. , the weight is also reduced.
  • the shock absorber D of the present embodiment it is possible to use the knuckle bracket 4 that is small and light.
  • the cost and overall weight of the buffer D can be reduced.
  • the cutouts 10 and 11 are rectangular and the corners are chamfered in an R-shape. Stress concentration can be alleviated when a load is input.
  • the shape and dimensions of the mounting pieces 7 and 8 and the connecting piece 9 of the knuckle bracket 4 can be appropriately changed in design according to the outer diameter of the outer shell 2, the shape of the knuckle of the vehicle, etc., as long as the above effects are not lost. Moreover, if the ends of the clamping pieces 5 and 6 in the circumferential direction do not interfere with welding to the outer shell 2, it is possible to protrude beyond the half of the outer shell 2 and extend to the side opposite to the mounting piece. This increases the weight of the clamping pieces 5 and 6 and makes it impossible to insert the outer shell 2 into the clamping pieces 5 and 6 from the side. It is preferable not to exceed half of the outer shell 2 when viewed in the axial direction.
  • the material yield of the knuckle bracket 4 can be increased.
  • the axial length of the circumferential ends of the clamping pieces 5 and 6 in the axial direction of the outer shell 2 can be appropriately changed in design according to the joint strength required by the specifications.
  • the inner peripheral surfaces of the clamping pieces 5 and 6 may be curved surfaces with varying curvatures. Furthermore, as long as the outer shell 2 can be brought into contact with the proximal end side of the inner peripheral surfaces of the clamping pieces 5 and 6, the shape of the inner peripheral surfaces of the clamping pieces 5 and 6 can be arbitrarily designed. can be changed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

A shock absorber (D) according to the present embodiment comprises: a shock absorber body (1) having a cylindrical outer shell (2) and a rod (3) inserted into the outer shell (2) so as to be free to move; and a knuckle bracket (4) mounted to the lower circumferential end of the outer shell (2), wherein: the knuckle bracket (4) comprises a pair of clamping pieces (5, 6) curving along the periphery of the outer shell (2) and clamping the outer shell (2), a pair of mounting pieces (7, 8) extending in the radial direction of the outer shell (2) from the circumferential ends of each of the clamping pieces (5, 6) and facing each other, and a coupling piece (9) coupling the upper end of the mounting pieces (7, 8) to each other; the width between the circumferential tips of the inner surface of each of the clamping pieces (5, 6) is greater than the outer diameter of the outer shell (2); and the base ends rather than the circumferential tips of the inner surface of each of the clamping pieces (5, 6) are in contact with the outer circumference of the outer shell (2).

Description

緩衝器buffer
　本発明は、緩衝器に関する。 The present invention relates to buffers.
　緩衝器は、アウターシェルと、アウターシェル内に移動自在に挿入されるロッドとを備え、たとえば、車両におけるサスペンションに組み込まれて使用され、アウターシェルに対してピストンロッドが軸方向に移動する伸縮時に減衰力を発揮して車体と車輪の振動を抑制する。 The shock absorber includes an outer shell and a rod that is movably inserted into the outer shell, and is used, for example, by being incorporated in a suspension in a vehicle, and when the piston rod moves axially with respect to the outer shell, the shock absorber expands and contracts. The damping force is exerted to suppress the vibration of the vehicle body and wheels.
　このようにサスペンションに組み込まれる緩衝器は、たとえば、ストラット式サスペンションに利用される場合、アウターシェルの下端に車両の車輪を保持するナックルを取り付けるためのナックルブラケットが溶接によって取り付けられる。 A shock absorber built into a suspension in this way, for example, when used in a strut-type suspension, has a knuckle bracket attached by welding to the lower end of the outer shell for attaching a knuckle that holds the wheel of the vehicle.
　ナックルブラケットは、たとえば、ＪＰ２００２－１３０３６０Ａに開示されているように、アウターシェルの外周に当接する湾曲した一対のチューブ当接部と、各チューブ当接部の周方向の端部からアウターシェルの径方向へ向けて互いに平行して延びてナックルに連結可能な一対のナックル取付部と、各取付部の上端同士を連結する連結部とを備えたものがある（たとえば、特許文献１の図６参照）。 For example, as disclosed in JP2002-130360A, the knuckle bracket includes a pair of curved tube contact portions that contact the outer periphery of the outer shell, and a diameter of the outer shell extending from the circumferential end of each tube contact portion. A pair of knuckle mounting portions that extend in parallel to each other in a direction and can be connected to the knuckles, and a connecting portion that connects the upper ends of the respective mounting portions are provided (see, for example, FIG. 6 of Patent Document 1). ).
特開２００２－１３０３６０号公報Japanese Patent Application Laid-Open No. 2002-130360
　このように構成された緩衝器では、ナックルブラケットのチューブ当接部におけるアウターシェルに当接する内周面と連結部のアウターシェルに当接する側面とがアウターシェルの外周に沿うようにアウターシェルの外径の曲率と同じ曲率を持つ湾曲面となっている。 In the shock absorber configured in this way, the inner peripheral surface of the tube contact portion of the knuckle bracket that contacts the outer shell and the side surface of the connecting portion that contacts the outer shell are arranged outside the outer shell so that they follow the outer periphery of the outer shell. It has a curved surface with the same curvature as the curvature of the diameter.
　よって、アウターシェルとナックルブラケットとが設計寸法通りに成型されると、チューブ当接部の内周面と連結部の側面とがアウターシェルの外周にぴったりと当接し、チューブ当接部の下端を除きチューブ当接部と連結部との周囲がアウターシェルに溶接されてナックルブラケットがアウターシェルに固定される。 Therefore, when the outer shell and the knuckle bracket are molded according to the design dimensions, the inner peripheral surface of the tube contact portion and the side surface of the connecting portion are in tight contact with the outer periphery of the outer shell, and the lower end of the tube contact portion is The periphery of the tube abutting portion and connecting portion is welded to the outer shell to fix the knuckle bracket to the outer shell.
　ところが、実際には、ナックルブラケットの寸法とアウターシェルの寸法とには寸法公差があるため、製品毎にナックルブラケットとアウターシェルとの当接状況が変化してしまい、ナックルブラケットとアウターシェルとがぴったりと当接せず、両者の間にガタが生じて両者の溶接品質が製品毎に異なってしまい安定しないという問題がある。 However, in reality, since there is a dimensional tolerance between the dimensions of the knuckle bracket and the dimensions of the outer shell, the contact situation between the knuckle bracket and the outer shell changes for each product. There is a problem that they do not come into close contact with each other, and play occurs between them, and the quality of welding between the two differs from product to product, resulting in instability.
　そこで、本発明は、アウターシェルとナックルブラケットとの溶接部における溶接品質を向上し得るとともに安定させ得る緩衝器の提供を目的としている。 Accordingly, an object of the present invention is to provide a shock absorber capable of improving and stabilizing the welding quality at the welded portion between the outer shell and the knuckle bracket.
　前記課題を解決するため、本発明の緩衝器は、円筒状のアウターシェルと、アウターシェル内に移動自在に挿入されるロッドとを有する緩衝器本体と、アウターシェルの下端外周に取り付けられるナックルブラケットとを備え、ナックルブラケットは、アウターシェルの外周に沿って湾曲するとともにアウターシェルを挟持する一対の挟持片と、各挟持片の周方向の端部からそれぞれアウターシェルの径方向へ延びて互いに対向する一対の取付片と、取付片の端同士を連結する連結片とを備え、各挟持片の内周面の周方向の先端よりも基端側がアウターシェルの外周に当接する。 In order to solve the above problems, the shock absorber of the present invention comprises a shock absorber main body having a cylindrical outer shell, a rod movably inserted into the outer shell, and a knuckle bracket attached to the outer circumference of the lower end of the outer shell. The knuckle bracket includes a pair of clamping pieces curved along the outer periphery of the outer shell and clamping the outer shell, and radial ends of the clamping pieces extending in the radial direction of the outer shell to face each other. and a connecting piece for connecting the ends of the mounting pieces, and the base end side of the inner peripheral surface of each clamping piece contacts the outer periphery of the outer shell rather than the distal end in the circumferential direction.
　このように構成された緩衝器では、アウターシェルを側方から挟持片間に挿入すると、アウターシェルは、挟持片の周方向の先端に引っ掛からずに挟持片間に侵入し、挟持片の内周面の周方向で先端を除いた基端側の或る２箇所に当接して安定的に支持され、挟持片の内周面および連結片の側面とアウターシェルとの間に過度に大きな隙間が生じることがない。 In the shock absorber configured in this way, when the outer shell is inserted between the clamping pieces from the side, the outer shell enters between the clamping pieces without being caught by the ends of the clamping pieces in the circumferential direction, and is pushed into the inner periphery of the clamping pieces. In the circumferential direction of the surface, it is stably supported by abutting on two points on the base end side excluding the tip end, and an excessively large gap is formed between the inner peripheral surface of the clamping piece and the side surface of the connecting piece and the outer shell. never occur.
図１は、一実施の形態における緩衝器の側面図である。FIG. 1 is a side view of a shock absorber in one embodiment. 図２は、一実施の形態における緩衝器のナックルブラケットの正面図である。FIG. 2 is a front view of the knuckle bracket of the shock absorber in one embodiment. 図３は、一実施の形態における緩衝器のナックルブラケットの側面図である。FIG. 3 is a side view of the knuckle bracket of the shock absorber in one embodiment. 図４は、一実施の形態における緩衝器のナックルブラケットの平面図である。FIG. 4 is a plan view of the knuckle bracket of the shock absorber in one embodiment. 図５は、一実施の形態における緩衝器に取り付けられたナックルブラケットの平面図である。FIG. 5 is a plan view of the knuckle bracket attached to the shock absorber in one embodiment. 図６（ａ）は、ナックルブラケットを展開した形状に打ち抜かれた平板である。図６（ｂ）は、挟持片と取付片を成型したナックルブラケットの半製品である。図６（ｃ）は、取付片にボルト挿通孔を穿った後のナックルブラケットの半製品である。FIG. 6(a) is a flat plate punched into a shape in which the knuckle bracket is developed. FIG. 6(b) shows a half-finished product of a knuckle bracket in which a clamping piece and an attachment piece are molded. FIG. 6(c) shows a half-finished knuckle bracket after drilling bolt insertion holes in the mounting piece.
　以下、図に示した実施の形態に基づき、本発明を説明する。図１および図２に示すように、緩衝器Ｄは、アウターシェル２と、アウターシェル２内に移動自在に挿入されるロッド３とを有する緩衝器本体１と、アウターシェル２の下端側の外周に溶接によって取付けられるナックルブラケット４とを備えており、ナックルブラケット４を利用して図示しない車両の車輪を支持するナックルに連結されて車両の車体と車輪との間に介装される。 The present invention will be described below based on the embodiments shown in the drawings. As shown in FIGS. 1 and 2, the shock absorber D includes a shock absorber body 1 having an outer shell 2 and a rod 3 movably inserted into the outer shell 2; The knuckle bracket 4 is connected to a knuckle supporting a vehicle wheel (not shown) and interposed between the vehicle body and the wheel.
　以下、緩衝器Ｄの各部について詳細に説明する。緩衝器本体１は、筒状のアウターシェル２と、アウターシェル２内に移動自在に挿入されるロッド３とを有して、ロッド３がアウターシェル２に対して軸方向に相対移動する伸縮作動時にロッド３のアウターシェル２に対する相対移動を妨げる減衰力を発生して、車両の車体と車輪の振動を減衰させる。 Each part of the buffer D will be described in detail below. The shock absorber main body 1 has a cylindrical outer shell 2 and a rod 3 movably inserted into the outer shell 2, and the rod 3 moves relative to the outer shell 2 in the axial direction. At times, a damping force is generated to prevent the relative movement of the rod 3 with respect to the outer shell 2, thereby damping the vibration of the vehicle body and wheels.
　緩衝器本体１は、たとえば、下端が閉塞される筒状のアウターシェル２と、アウターシェル２内に収容される図示しないシリンダと、シリンダ内に移動自在に挿入されるロッド３と、ロッド３に連結されるとともにシリンダ内に挿入されてシリンダ内を伸側室と圧側室とに区画するピストンと、シリンダとアウターシェル２との間に形成されるリザーバと、シリンダの下端に設けられて圧側室とリザーバとを仕切るバルブケースとを備えている。そして、伸側室と圧側室には、作動油等の液体が充填され、リザーバには、液体と気体とが充填されている。なお、緩衝器Ｄに使用される液体は、作動油以外にも、たとえば、水、水溶液といった液体でもよい。なお、アウターシェル２は、ナックルブラケット４が取り付けられる緩衝器本体１の最外殻を成す部材であり、緩衝器本体１が倒立型に設定される場合にはシリンダ等を収容する代わりにロッドを覆う部材であってもよい。 The shock absorber body 1 includes, for example, a cylindrical outer shell 2 whose lower end is closed, a cylinder (not shown) accommodated in the outer shell 2, a rod 3 movably inserted into the cylinder, and a A piston that is connected and inserted into the cylinder to divide the inside of the cylinder into an expansion side chamber and a compression side chamber, a reservoir formed between the cylinder and the outer shell 2, and a compression side chamber provided at the lower end of the cylinder. It has a valve case that separates the reservoir. The expansion side chamber and the compression side chamber are filled with liquid such as hydraulic oil, and the reservoir is filled with liquid and gas. The liquid used in the buffer D may be liquid such as water or an aqueous solution other than hydraulic oil. The outer shell 2 is a member forming the outermost shell of the shock absorber body 1 to which the knuckle bracket 4 is attached. It may be a covering member.
　また、緩衝器本体１は、伸側室と圧側室とを連通する通路と、圧側室とリザーバとを連通する通路とを備え、各通路には、それぞれ減衰バルブが設けられている。このように構成された緩衝器本体１は、伸縮作動時にピストンによって伸側室と圧側室とが拡縮されて液体が通路を介して移動し、この液体の流れに前記減衰バルブが抵抗を与えて減衰力を発生する。 In addition, the shock absorber main body 1 includes a passage that communicates the expansion side chamber and the compression side chamber, and a passage that communicates the compression side chamber and the reservoir, and each passage is provided with a damping valve. In the shock absorber main body 1 constructed in this manner, the expansion side chamber and the compression side chamber are expanded and contracted by the piston when the shock absorber main body 1 is constructed as described above, and the liquid moves through the passage. generate force.
　なお、アウターシェル２の中間の外周には、図示しない懸架ばねの下端を支承する下方懸架ばね受１６が装着されている。図外の懸架ばねは、ロッド３の先端に取り付けられる上方懸架ばね受と前記した下方懸架ばね受１６との間に介装されており、緩衝器Ｄを車体と車輪との間に介装すると車体を弾性支持する。 A lower suspension spring bearing 16 that supports the lower end of a suspension spring (not shown) is attached to the outer circumference of the middle of the outer shell 2 . A suspension spring (not shown) is interposed between the upper suspension spring bearing attached to the tip of the rod 3 and the lower suspension spring bearing 16. When the shock absorber D is interposed between the vehicle body and the wheel, Elastically supports the vehicle body.
　ナックルブラケット４は、図１から図５に示すように、一枚金属板を母材して、当該母材をナックルブラケット４を展開した形状に打ち抜いた後で曲げ加工することによって形成されている。ナックルブラケット４は、アウターシェル２の外周に沿って湾曲するとともにアウターシェル２を挟持する一対の挟持片５，６と、各挟持片５，６の周方向の端部からそれぞれアウターシェル２の径方向へ延びて互いに対向する一対の取付片７，８と、取付片７，８の上端同士を連結する連結片９と、挟持片５，６、取付片７，８および連結片９とが交わる三面交点を切除する一対の切欠１０，１１とを備えている。 As shown in FIGS. 1 to 5, the knuckle bracket 4 is formed by using a single metal plate as a base material, punching the base material into a shape in which the knuckle bracket 4 is developed, and then bending the base material. . The knuckle bracket 4 includes a pair of clamping pieces 5 and 6 that curve along the outer periphery of the outer shell 2 and clamp the outer shell 2 , and extend from the circumferential ends of the clamping pieces 5 and 6 to the diameter of the outer shell 2 . A pair of mounting pieces 7 and 8 extending in a direction and facing each other, a connecting piece 9 connecting the upper ends of the mounting pieces 7 and 8, and the clamping pieces 5 and 6, the mounting pieces 7 and 8 and the connecting piece 9 intersect. It has a pair of cutouts 10, 11 for cutting out the intersection of three faces.
　挟持片５，６は、それぞれ、アウターシェル２の軸方向から見てアウターシェル２の下端の外周形状に沿うように湾曲したプレートであって、アウターシェル２の側方から見てアウターシェル２の軸方向に沿って内周面を当接させている。 Each of the clamping pieces 5 and 6 is a plate curved along the outer peripheral shape of the lower end of the outer shell 2 when viewed from the axial direction of the outer shell 2 . The inner peripheral surface is brought into contact along the axial direction.
　図４に示した通り、挟持片５，６をアウターシェル２の外周に当接させると、挟持片５の内周面の周方向の先端よりも基端側と挟持片６の内周面の周方向の先端よりも基端側がアウターシェル２の外周に当接して、挟持片５，６の内周面の先端とアウターシェル２の外周との間に隙間が生じる。よって、アウターシェル２の外周が各挟持片５，６の内周面の先端を除いて先端よりも基端側の或る箇所にそれぞれ当接するので、アウターシェル２は挟持片５，６によって２箇所で支持される。 As shown in FIG. 4, when the clamping pieces 5 and 6 are brought into contact with the outer periphery of the outer shell 2, the inner peripheral surface of the clamping piece 6 and the base end side of the distal end of the inner peripheral surface of the clamping piece 5 in the circumferential direction are separated from each other. A gap is formed between the tips of the inner peripheral surfaces of the clamping pieces 5 and 6 and the outer periphery of the outer shell 2 because the base end side contacts the outer periphery of the outer shell 2 rather than the distal end in the circumferential direction. Therefore, since the outer periphery of the outer shell 2 abuts on the inner peripheral surface of each of the clamping pieces 5 and 6 except for the distal ends thereof, the outer shell 2 is held by the clamping pieces 5 and 6. supported in place.
　なお、本実施の形態の緩衝器Ｄでは、挟持片５，６の内周面の曲率半径は、アウターシェル２の外周の半径よりも大きく、挟持片５，６の内周面の曲率中心ｃ１は、アウターシェル２を軸方向から見て連結片９の周方向の中央とアウターシェル２の外径の中心Ｏを通る直線Ｓ上であって前記中心Ｏよりも反連結片側に配置されている。 In the shock absorber D of the present embodiment, the radius of curvature of the inner peripheral surfaces of the clamping pieces 5 and 6 is larger than the radius of the outer periphery of the outer shell 2, and the center of curvature c1 of the inner peripheral surfaces of the clamping pieces 5 and 6 is arranged on a straight line S passing through the center O of the outer diameter of the outer shell 2 and the center O of the outer diameter of the outer shell 2 when viewed from the axial direction of the outer shell 2 and on the opposite side of the connecting piece from the center O. .
　また、挟持片５，６の周方向の反取付片側端となる先端は、アウターシェル２の軸線方向から見てアウターシェル２の半分を超えないようになっている。このように、挟持片５，６の反取付片側端となる先端がアウターシェル２の軸線方向から見てアウターシェル２の半分を超えないので、ナックルブラケット４をアウターシェル２の外周に溶接するためにアウターシェル２の下端外周へ当接させる際に、ナックルブラケット４をアウターシェル２の側方から接近させればよいので、組付作業が容易となる。なお、図４に示したところでは、挟持片５，６の内周面における周方向の反取付片側端となる先端同士の幅Ｗがアウターシェル２の外径よりも長いが、挟持片５の内周面の周方向の先端よりも基端側と挟持片６の内周面の周方向の先端よりも基端側がアウターシェル２の外周に当接するようになっていれば、前記幅Ｗは、アウターシェル２の外径より短くてもよい。 In addition, the tips of the clamping pieces 5 and 6, which are opposite to the mounting piece side ends in the circumferential direction, do not exceed half of the outer shell 2 when viewed from the axial direction of the outer shell 2. As described above, since the ends of the clamping pieces 5 and 6 opposite to the attachment piece do not exceed half of the outer shell 2 when viewed from the axial direction of the outer shell 2, the knuckle bracket 4 is welded to the outer periphery of the outer shell 2. When the knuckle bracket 4 is brought into contact with the outer periphery of the lower end of the outer shell 2, the knuckle bracket 4 can be approached from the side of the outer shell 2, which facilitates the assembly work. 4, the width W between the tips of the inner peripheral surfaces of the clamping pieces 5 and 6, which are opposite to the mounting piece side ends in the circumferential direction, is longer than the outer diameter of the outer shell 2. If the proximal side of the inner peripheral surface relative to the distal end in the circumferential direction and the proximal end side of the inner peripheral surface of the clamping piece 6 relative to the distal end in the circumferential direction are in contact with the outer periphery of the outer shell 2, the width W is , may be shorter than the outer diameter of the outer shell 2 .
　また、取付片７，８は、それぞれ挟持片５，６の周方向の基端から互いにアウターシェル２の径方向へ平行に延びて対向しており、図示しないナックルの取付部に設けられた２つの孔に対向可能な位置にそれぞれ２つずつボルト挿入孔７ａ，８ａを備えている。そして、取付片７，８の間に図外のナックルの取付部を挿入し、ボルト挿入孔７ａ，８ａに挿入されるナックルの取付部を貫通する図示しないボルトとナットによって、取付片７，８と前記取付部をボルト締結して、このナックルブラケット４をナックルに取付できるようになっている。 The mounting pieces 7 and 8 extend parallel to each other in the radial direction of the outer shell 2 from the proximal ends of the clamping pieces 5 and 6 in the circumferential direction and face each other. Two bolt insertion holes 7a and 8a are provided at positions that can face two holes. Then, a knuckle mounting portion (not shown) is inserted between the mounting pieces 7 and 8, and the mounting pieces 7 and 8 are secured by a bolt and nut (not shown) passing through the knuckle mounting portion inserted into the bolt insertion holes 7a and 8a. The knuckle bracket 4 can be attached to the knuckle by bolting the attachment portion.
　また、取付片７と挟持片５の下端および取付片８と挟持片６の下端は、アウターシェル２から遠ざかるように外方へ折り曲げられてフランジ状の補強リブ１２，１３が設けられている。さらに、取付片７の上下方向の中央から挟持片５の上下方向の中央に欠けてアウターシェル２から遠ざかるように膨出するバルジ部１４が設けられるとともに、取付片８の上下方向の中央から挟持片６の上下方向の中央に欠けてアウターシェル２から遠ざかるように膨出するバルジ部１５が設けられている。補強リブ１２，１３およびバルジ部１４，１５は、ナックルブラケット４を変形させる荷重に対する強度を向上するために設けられている。 Further, the lower ends of the mounting piece 7 and the clamping piece 5 and the lower ends of the mounting piece 8 and the clamping piece 6 are outwardly bent away from the outer shell 2 and provided with flange-like reinforcing ribs 12 and 13 . In addition, a bulge portion 14 is provided which is cut away from the vertical center of the mounting piece 7 to the vertical center of the clamping piece 5 and bulges away from the outer shell 2 , and clamps the mounting piece 8 from the vertical center. A bulge portion 15 is provided at the center of the piece 6 in the vertical direction and bulges away from the outer shell 2 . Reinforcement ribs 12 and 13 and bulge portions 14 and 15 are provided to improve strength against loads that deform knuckle bracket 4 .
　さらに、取付片７，８の上端は、取付片７，８に対して垂直な連結片９によって連結されている。連結片９の挟持片５，６側を向いてアウターシェル２の外周面に対向する側面９ａは、アウターシェル２の外周に沿うように湾曲しており、挟持片５，６をアウターシェル２の外周に当接させると連結片９の側面９ａもまたアウターシェル２の外周に当接する。このように、ナックルブラケット４は、取付片７，８と連結片９とが箱形となっていて、取付片７，８の基端がそれぞれ挟持片５，６に連なる構造をしている。なお、連結片９の図４中の左右方向の中央には、基準孔９ｂが設けられている。 Furthermore, the upper ends of the mounting pieces 7 and 8 are connected by a connecting piece 9 perpendicular to the mounting pieces 7 and 8. A side surface 9 a of the connecting piece 9 facing the clamping pieces 5 and 6 and facing the outer peripheral surface of the outer shell 2 is curved along the outer periphery of the outer shell 2 so that the clamping pieces 5 and 6 are attached to the outer shell 2 . When the connecting piece 9 is brought into contact with the outer periphery, the side surface 9a of the connecting piece 9 also contacts the outer periphery of the outer shell 2. As shown in FIG. In this manner, the knuckle bracket 4 has a box-shaped attachment pieces 7, 8 and a connecting piece 9, and has a structure in which the proximal ends of the attachment pieces 7, 8 are connected to the clamping pieces 5, 6, respectively. A reference hole 9b is provided in the center of the connecting piece 9 in the horizontal direction in FIG.
　連結片９の前記アウターシェルに対向する側面９ａは、湾曲しており、前記アウターシェル２の外周に当接する。詳しくは、連結片９の側面９ａにおける曲率半径は、挟持片５，６の内周面における曲率半径と等しく、アウターシェル２の外径の半径よりも大きい。また、連結片９の側面９ａの曲率中心ｃ２は、アウターシェル２を軸方向から見て連結片９の中央とアウターシェル２の外径の中心Ｏを通る直線Ｓ上であって前記中心Ｏよりも反連結片側であって挟持片５，６の内周面の曲率中心ｃ１よりも連結片側に配置されている。 A side surface 9a of the connecting piece 9 facing the outer shell is curved and contacts the outer periphery of the outer shell 2. Specifically, the radius of curvature of the side surface 9 a of the connecting piece 9 is equal to the radius of curvature of the inner peripheral surfaces of the clamping pieces 5 and 6 and larger than the radius of the outer diameter of the outer shell 2 . Further, the center of curvature c2 of the side surface 9a of the connecting piece 9 is on a straight line S passing through the center O of the outer diameter of the outer shell 2 and the center of the connecting piece 9 when the outer shell 2 is viewed from the axial direction. is located on the side opposite to the connecting piece and closer to the connecting piece than the center of curvature c1 of the inner peripheral surfaces of the clamping pieces 5 and 6. As shown in FIG.
　つまり、連結片９の側面９ａおよび各挟持片５，６の内周面の曲率半径は、等しいとともにアウターシェル２の半径よりも大きく、連結片９の側面９ａの曲率中心ｃ２は、連結片９の周方向の中心とアウターシェル２の半径の中心Ｏとを通る直線Ｓ上であってアウターシェル２の半径の中心Ｏよりも反連結片側に配置されるとともに、各挟持片５，６の曲率中心ｃ１は、直線Ｓ上であって連結片９の側面９ａの曲率中心ｃ２よりも反連結片側に配置されている。より詳細には、連結片９の側面９ａおよび各挟持片５，６の内周面の曲率半径ｄ１は、アウターシェル２の半径ｄ２よりも大きく、連結片９の側面９ａの曲率中心ｃ２は、アウターシェル２の半径の中心Ｏよりも反連結片側に配置されており、各挟持片５，６の曲率中心ｃ１は、直線Ｓ上であって連結片９の側面９ａの曲率中心ｃ２よりも反連結片側に配置されている。 That is, the radii of curvature of the side surface 9a of the connecting piece 9 and the inner peripheral surfaces of the clamping pieces 5 and 6 are equal and larger than the radius of the outer shell 2, and the center of curvature c2 of the side surface 9a of the connecting piece 9 and the center O of the radius of the outer shell 2 and on the side opposite to the connecting piece side of the center O of the radius of the outer shell 2. The center c1 is arranged on the straight line S and on the opposite side of the connecting piece from the center of curvature c2 of the side surface 9a of the connecting piece 9. As shown in FIG. More specifically, the radius of curvature d1 of the side surface 9a of the connecting piece 9 and the inner peripheral surfaces of the clamping pieces 5 and 6 is larger than the radius d2 of the outer shell 2, and the center of curvature c2 of the side surface 9a of the connecting piece 9 is The center O of the radius of the outer shell 2 is arranged on the side opposite to the connecting piece, and the center of curvature c1 of each of the clamping pieces 5 and 6 is on the straight line S and is opposite to the center of curvature c2 of the side surface 9a of the connecting piece 9. Located on one side of the connection.
　また、ナックルブラケット４は、挟持片５と取付片７との境の上端と、挟持片６と取付片８との境の上端とに、それぞれ切欠１０，１１を備えている。切欠１０は、挟持片５、取付片７および連結片９の３つの面の交点である三面交点を切除するように設けられており、切欠１１は、挟持片６、取付片８および連結片９の３つの面の交点である三面交点を切除するように設けられている。 In addition, the knuckle bracket 4 has cutouts 10 and 11 at the upper end of the boundary between the holding piece 5 and the mounting piece 7 and the upper end of the boundary between the holding piece 6 and the mounting piece 8, respectively. The notch 10 is provided so as to cut the intersection of the three surfaces of the clamping piece 5 , the mounting piece 7 and the connecting piece 9 , and the notch 11 cuts the clamping piece 6 , the mounting piece 8 and the connecting piece 9 . It is provided so as to excise the three-plane intersection point, which is the intersection point of the three planes of .
　各切欠１０，１１は、挟持片５，６、取付片７，８および連結片９の境の上端から開口して下方へ向けて母材を矩形に切り欠いて形成されており、４つの角部にＲ形状に面取りが施されて形成された面取り部１０ａ，１１ａを備えている。 Each notch 10, 11 is formed by notching the base material in a rectangular shape, opening from the upper end of the boundary between the clamping pieces 5, 6, the mounting pieces 7, 8, and the connecting piece 9, and cutting the base material downward. It has chamfered portions 10a and 11a formed by chamfering in an R shape.
　以上のように構成されたナックルブラケット４は、以下の手順によって製造去られる。まず、図示しない矩形の金属製の平板状のブランクの母材を打ち抜いて、図６（ａ）に示したナックルブラケット４を展開した形状の平板を得る。なお、連結片９における基準孔９ｂもブランクの母材を打ち抜いて前記平板を得る加工によって形成される。基準孔９ｂは、平板における中央の位置を示す基準となり、母材の打ち抜き加工の後に続く平板を曲げ成型する加工において加工装置に対する位置合わせに利用される。 The knuckle bracket 4 configured as above is manufactured by the following procedure. First, a base material of a rectangular metal plate-like blank (not shown) is punched out to obtain a flat plate having a shape in which the knuckle bracket 4 shown in FIG. 6A is developed. The reference hole 9b in the connecting piece 9 is also formed by punching out a blank base material to obtain the flat plate. The reference hole 9b serves as a reference indicating the position of the center of the flat plate, and is used for positioning with respect to the processing device in bending and forming the flat plate following punching of the base material.
　つづいて、プレス加工によって平板を曲げ成型して図６（ｂ）に示すように、挟持片５，６、取付片７，８、補強リブ１２，１３およびバルジ部１４，１５の成型を行ったのち、図６（ｃ）に示すように取付片７，８にボルト挿入孔７ａ，８ａを打ち抜く。図６（ｃ）で孔明けが済んだナックルブラケット４の半製品を図６（ｃ）中の破線で折り曲げる曲げ加工を行えば、連結片９と取付片７，８とが直角に折り曲げられ、ナックルブラケット４を製造することができる。 Subsequently, the flat plate was bent by press working, and as shown in FIG. After that, as shown in FIG. 6(c), the mounting pieces 7 and 8 are punched with bolt insertion holes 7a and 8a. 6(c), the half-finished product of the knuckle bracket 4, which has been perforated in FIG. 6(c), is bent along the broken lines in FIG. A knuckle bracket 4 can be manufactured.
　このようにナックルブラケット４は製造されるが、挟持片５，６、取付片７，８および連結片９の２つの三面交点がそれぞれ切欠１０，１１によって切除されており、挟持片５，６と連結片９および各取付片７，８の境とが地続きになっていないので、連結片９と各取付片７，８との境で折り曲げる成型を行う際に挟持片５，６が折り曲げ成型の邪魔にならない。よって、挟持片５，６、取付片７，８および連結片９との三面交点ができてしまう形状のナックルブラケット４であっても無理なく成型できる。 Although the knuckle bracket 4 is manufactured in this manner, the two three-sided intersections of the clamping pieces 5, 6, the mounting pieces 7, 8, and the connecting piece 9 are cut off by notches 10, 11, respectively. Since the connecting piece 9 and the boundaries between the mounting pieces 7 and 8 are not connected to each other, the clamping pieces 5 and 6 are bent at the boundary between the connecting piece 9 and the mounting pieces 7 and 8. out of the way. Therefore, even the knuckle bracket 4 having a three-sided intersection with the clamping pieces 5, 6, the mounting pieces 7, 8, and the connecting piece 9 can be molded without difficulty.
　こうして得られたナックルブラケット４をアウターシェル２の外周に側方から接近させて当接させると、挟持片５，６の湾曲した内周面の先端よりも基端側の２箇所でアウターシェル２の外周面に当接するとともに、連結片９の側面９ａがアウターシェル２の外周面に当接するので、アウターシェル２は、周方向でナックルブラケット４によって３点で支持される。 When the knuckle bracket 4 obtained in this way is brought close to the outer periphery of the outer shell 2 from the side and brought into contact with it, the outer shell 2 is clamped at two points on the proximal side of the curved inner peripheral surfaces of the clamping pieces 5 and 6 from the distal ends. The outer shell 2 is supported by the knuckle bracket 4 at three points in the circumferential direction.
　挟持片５，６の内周面における反取付片側端となる先端同士の幅Ｗは、アウターシェル２の外径よりも大きいので、アウターシェル２を側方から挟持片５，６間に挿入すると、アウターシェル２は、挟持片５，６の周方向の先端に引っ掛からずに挟持片５，６間に侵入し、挟持片５，６の内周面の周方向で先端を除いた基端側の或る２箇所に当接して挟持片５，６によって周方向で支持される。よって、アウターシェル２および挟持片５，６の寸法に多少の誤差があってアウターシェル２が連結片９に当接できない状況となっても、アウターシェル２は挟持片５，６の内周面によって必ず２点で安定的に支持されるとともに、アウターシェル２と挟持片５，６の内周面との間およびアウターシェル２と連結片９の側面９ａとの間に大きな隙間が形成されることはない。よって、アウターシェル２が挟持片５，６の内周面の先端に当接して挟持片５，６から浮き上がるような事態となって、挟持片５，６の内周面および連結片９の側面９ａとアウターシェル２との間に過度に大きな隙間が生じるようなことがなく、アウターシェル２が挟持片５，６間で遊んでガタつくこともない。なお、アウターシェル２が挟持片５，６間でガタつきがある状態で、ナックルブラケット４がアウターシェル２に溶接されると、アウターシェル２に対してナックルブラケット４が適正な位置に取り付けられずに、緩衝器Ｄのナックルへの連結が困難となる恐れがあるが、本実施の形態の緩衝器Ｄでは、このような事態を回避できる。 Since the width W between the tips of the inner peripheral surfaces of the clamping pieces 5 and 6 that are opposite to the mounting piece side ends is larger than the outer diameter of the outer shell 2, when the outer shell 2 is inserted between the clamping pieces 5 and 6 from the side, , the outer shell 2 enters between the clamping pieces 5 and 6 without being caught by the distal ends of the clamping pieces 5 and 6 in the circumferential direction, and extends to the proximal end side of the inner peripheral surfaces of the clamping pieces 5 and 6 except for the distal ends in the circumferential direction. are supported in the circumferential direction by the clamping pieces 5 and 6. Therefore, even if the outer shell 2 and the clamping pieces 5 and 6 have some errors in their dimensions and the outer shell 2 cannot come into contact with the connecting piece 9, the outer shell 2 can still maintain the inner peripheral surfaces of the clamping pieces 5 and 6. A large gap is formed between the outer shell 2 and the inner peripheral surfaces of the clamping pieces 5 and 6 and between the outer shell 2 and the side surface 9a of the connecting piece 9. never. As a result, the outer shell 2 comes into contact with the tips of the inner peripheral surfaces of the clamping pieces 5 and 6 and is lifted from the clamping pieces 5 and 6 . An excessively large gap does not occur between the 9a and the outer shell 2, and the outer shell 2 does not play between the clamping pieces 5 and 6 and rattle. If the knuckle bracket 4 is welded to the outer shell 2 while the outer shell 2 is loose between the clamping pieces 5 and 6, the knuckle bracket 4 cannot be attached to the outer shell 2 at a proper position. In addition, it may become difficult to connect the shock absorber D to the knuckle, but the shock absorber D of this embodiment can avoid such a situation.
　このように、アウターシェル２と挟持片５，６の内周面および連結片９の側面９ａとの間に大きな隙間が生じることなく、アウターシェル２がナックルブラケット４に対して周方向で安定的に支持された後、ナックルブラケット４が溶接によってアウターシェル２に固定される。 In this way, the outer shell 2 is stable in the circumferential direction with respect to the knuckle bracket 4 without forming a large gap between the outer shell 2 and the inner peripheral surfaces of the clamping pieces 5 and 6 and the side surface 9a of the connecting piece 9. , the knuckle bracket 4 is fixed to the outer shell 2 by welding.
　具体的には、図１および図５に示すように、挟持片５の上端の先端側から連結片９の側面の上方を経由して反対側の挟持片６の上端の先端側にかけてアウターシェル２にアーク溶接されるとともに、各挟持片５，６の先端がアウターシェル２の外周に軸方向に沿ってアーク溶接され、ナックルブラケット４が溶接によってアウターシェル２に固定される。 Specifically, as shown in FIGS. 1 and 5 , the outer shell 2 extends from the tip of the upper end of the clamping piece 5 to the tip of the upper end of the clamping piece 6 on the opposite side via the upper side of the connecting piece 9 . , the tips of the clamping pieces 5 and 6 are arc-welded to the outer circumference of the outer shell 2 along the axial direction, and the knuckle bracket 4 is fixed to the outer shell 2 by welding.
　このように、本実施の形態の緩衝器Ｄでは、挟持片５の上端の反取付片側端の近傍から連結片９の側面の上方を経由して反対側の挟持片６の上端の反取付片側端の近傍までにかけて溶接部Ｂ１が形成されるとともに、アウターシェル２の軸方向に沿って各挟持片５，６の反取付片側端の上端近傍から下端近傍までにかけて直線状の溶接部Ｂ２が形成される。なお、溶接部Ｂ１，Ｂ２は、ナックルブラケット４およびアウターシェル２の被溶接材料と溶接材料とが溶融して形成されるが、アウターシェル２がナックルブラケット４に安定的に支持されるとともにアウターシェル２と挟持片５，６の内周面および連結片９の側面９ａとの間に過度に大きな隙間が生じない。よって、溶融したビードが溶接部Ｂ１，Ｂ２に留まって流れ落ちずないので、良好な溶接部Ｂ１，Ｂ２を形成できる。よって、アウターシェル２とナックルブラケット４との溶接品質が向上するとともに溶接品質が安定して、ナックルブラケット４は、アウターシェル２に強固に固定される。 Thus, in the buffer D of the present embodiment, the upper end of the clamping piece 6 on the opposite side from the vicinity of the upper end of the clamping piece 5 opposite to the mounting piece side via the upper side of the side surface of the connecting piece 9 is located on the opposite side of the clamping piece 6 . A welded portion B1 is formed up to the vicinity of the end, and a linear welded portion B2 is formed along the axial direction of the outer shell 2 from the vicinity of the upper end to the vicinity of the lower end of the opposite side end of each clamping piece 5, 6. be done. Although the welded portions B1 and B2 are formed by melting the material to be welded and the welding material of the knuckle bracket 4 and the outer shell 2, the outer shell 2 is stably supported by the knuckle bracket 4 and the outer shell 2 and the inner peripheral surfaces of the clamping pieces 5 and 6 and the side surface 9a of the connecting piece 9 do not form an excessively large gap. Therefore, the melted bead stays in the welded portions B1 and B2 and does not flow down, so that the welded portions B1 and B2 can be formed in good condition. Therefore, the welding quality between the outer shell 2 and the knuckle bracket 4 is improved and the welding quality is stabilized, and the knuckle bracket 4 is firmly fixed to the outer shell 2 .
　また、ナックルブラケット４は、取付片７，８の上端同士を接続する連結片９と備えていて、取付片７，８と連結片９とで箱形を形成しているため高い強度を実現でき、車両の車輪を支持するナックルから入力される曲げ、せん断或いは引っ張りなどの種々の荷重にも十分に耐え得る。 Further, the knuckle bracket 4 is provided with a connecting piece 9 that connects the upper ends of the mounting pieces 7 and 8, and since the mounting pieces 7 and 8 and the connecting piece 9 form a box shape, high strength can be realized. , and can withstand various loads such as bending, shearing or pulling input from the knuckles supporting the wheels of the vehicle.
　このように、高強度のナックルブラケット４を得るためには、取付片７，８の上端の挟持片５，６の付根から当該上端同士を接続する連結片９が不可欠であるが、切欠１０，１１を設けない場合、挟持片５，６、取付片７，８および連結片９の３つの面の交点である三面交点が母材に残ってしまい、連結片９に対して取付片７，８を直角に折り曲げる加工が難しく、ナックルブラケット４を成型することが非常に困難となってしまう。ところが、本実施の形態の緩衝器Ｄでは、ナックルブラケット４が挟持片５，６、取付片７，８および連結片９とが交わる三面交点を切除する切欠１０，１１を備えているので、連結片９と各取付片７，８との境で折り曲げる成型を行う際に挟持片５，６が折り曲げ成型の邪魔にならないナックルブラケット４を無理なく成型できる。 Thus, in order to obtain a high-strength knuckle bracket 4, it is essential to have a connecting piece 9 that connects the upper ends of the mounting pieces 7, 8 from the roots of the clamping pieces 5, 6 to each other. If 11 is not provided, the three-sided intersection point, which is the intersection of the three faces of the clamping pieces 5 and 6, the mounting pieces 7 and 8, and the connecting piece 9, remains on the base material. It is difficult to bend the knuckle bracket 4 at right angles, and it becomes very difficult to mold the knuckle bracket 4 . However, in the shock absorber D of this embodiment, since the knuckle bracket 4 is provided with the cutouts 10 and 11 at which the clamping pieces 5 and 6, the mounting pieces 7 and 8, and the connecting piece 9 intersect, the cutouts 10 and 11 are cut. The knuckle bracket 4 can be molded without difficulty in which the pinching pieces 5 and 6 do not interfere with the bending molding when the bending molding is performed at the boundary between the piece 9 and the mounting pieces 7 and 8.例文帳に追加
　以上のように、本実施の形態の緩衝器Ｄは、円筒状のアウターシェル２と、アウターシェル２内に移動自在に挿入されるロッド３とを有する緩衝器本体１と、アウターシェル２の下端外周に取り付けられるナックルブラケット４とを備え、ナックルブラケット４は、アウターシェル２の外周に沿って湾曲するとともにアウターシェル２を挟持する一対の挟持片５，６と、各挟持片５，６の周方向の端部からそれぞれアウターシェル２の径方向へ延びて互いに対向する一対の取付片７，８と、取付片７，８の端同士を連結する連結片９とを備え、各挟持片５，６の内周面の周方向の先端よりも基端側がアウターシェル２の外周に当接させている。 As described above, the shock absorber D of this embodiment includes the shock absorber main body 1 having the cylindrical outer shell 2 and the rod 3 movably inserted into the outer shell 2 , and the lower end of the outer shell 2 . A knuckle bracket 4 is attached to the outer periphery of the outer shell 2. The knuckle bracket 4 is curved along the outer periphery of the outer shell 2 and sandwiches the outer shell 2 between the pair of clamping pieces 5 and 6. A pair of mounting pieces 7 and 8 extending in the radial direction of the outer shell 2 and facing each other, and a connecting piece 9 connecting the ends of the mounting pieces 7 and 8 are provided. The base end side of the inner peripheral surface of 6 is in contact with the outer periphery of the outer shell 2 rather than the distal end in the circumferential direction.
　このように構成された緩衝器Ｄでは、アウターシェル２を側方から挟持片５，６間に挿入すると、アウターシェル２は、挟持片５，６の周方向の先端に引っ掛からずに挟持片５，６間に侵入し、挟持片５，６の内周面の周方向で先端を除いた基端側の或る２箇所に当接して安定的に支持され、挟持片５，６の内周面および連結片９の側面９ａとアウターシェル２との間に過度に大きな隙間が生じることもない。このように、本実施の形態の緩衝器Ｄによれば、アウターシェル２がナックルブラケット４によって安定的に支持されるとともに、アウターシェル２と挟持片５，６の内周面および連結片９の側面９ａとの間に過度に大きな隙間が生じないので、挟持片５，６の上端、挟持片５，６の周方向の先端および連結片９の側面９ａとアウターシェル２との間を溶接すると溶接品質が良好かつ安定した溶接部Ｂ１，Ｂ２が得られる。以上より、本実施の形態の緩衝器Ｄによれば、アウターシェル２とナックルブラケット４との溶接部Ｂ１，Ｂ２における溶接品質の向上と安定とを両立できる。 In the shock absorber D configured in this way, when the outer shell 2 is inserted between the clamping pieces 5 and 6 from the side, the outer shell 2 does not get caught on the circumferential ends of the clamping pieces 5 and 6, and the clamping pieces 5 are pulled apart. , 6, and is stably supported by abutting on two points on the proximal end side of the inner peripheral surfaces of the clamping pieces 5, 6 except for the distal ends in the circumferential direction. An excessively large gap does not occur between the surface and the side surface 9 a of the connecting piece 9 and the outer shell 2 . Thus, according to the shock absorber D of the present embodiment, the outer shell 2 is stably supported by the knuckle bracket 4, and the inner peripheral surfaces of the outer shell 2 and the clamping pieces 5 and 6 and the connecting piece 9 are supported. Since an excessively large gap does not occur between the side surface 9a and the outer shell 2, the upper ends of the clamping pieces 5 and 6, the circumferential ends of the clamping pieces 5 and 6, the side surface 9a of the connecting piece 9, and the outer shell 2 can be welded together. Welded portions B1 and B2 having good and stable welding quality can be obtained. As described above, according to the shock absorber D of the present embodiment, it is possible to improve and stabilize the welding quality at the welded portions B1 and B2 between the outer shell 2 and the knuckle bracket 4 at the same time.
　また、本実施の形態の緩衝器Ｄでは、各挟持片５，６の内周面からアウターシェル２までの距離は、各挟持片５，６の内周面とアウターシェル２との接触点ａ１，ａ２から各挟持片５，６の先端側へ向かうほど広くなっている。このように緩衝器Ｄが構成されると、アウターシェル２の各挟持片５，６の内周面の先端側の幅が広くなるので、アウターシェル２を各挟持片５，６間への挿入がスムーズとなり、アウターシェル２を各挟持片５，６の内周面の基端側に安定的に当接させ得る。 Further, in the shock absorber D of the present embodiment, the distance from the inner peripheral surface of each clamping piece 5, 6 to the outer shell 2 is the contact point a1 between the inner peripheral surface of each clamping piece 5, 6 and the outer shell 2. , a2 toward the distal ends of the clamping pieces 5 and 6. As shown in FIG. When the shock absorber D is configured in this way, the width of the tip side of the inner peripheral surface of each of the clamping pieces 5 and 6 of the outer shell 2 becomes wider, so that the outer shell 2 can be inserted between the clamping pieces 5 and 6. is smooth, and the outer shell 2 can be stably brought into contact with the base ends of the inner peripheral surfaces of the clamping pieces 5 and 6 .
　なお、挟持片５，６の内周面は、曲率半径が変化する湾曲面とされてもよいが、各挟持片５，６の内周面の曲率半径が一定であってアウターシェル２の外周の半径よりも大きい場合には、ナックルブラケット４の製造が容易となるとともに寸法管理も容易となる。 The inner peripheral surfaces of the clamping pieces 5 and 6 may be curved surfaces with varying radii of curvature. is larger than the radius of the knuckle bracket 4, manufacturing of the knuckle bracket 4 is facilitated, and dimensional control is also facilitated.
　また、本実施の形態の緩衝器Ｄでは、アウターシェル２が挟持片５，６の内周面の周方向で先端を除いた基端側の２箇所で当接されることに加えて、連結片９の側面９ａにも当接する場合には、アウターシェル２がナックルブラケット４によって３点支持されるので、アウターシェル２とナックルブラケット４との溶接部Ｂ１，Ｂ２における溶接品質のより一層の向上と安定とを実現できるとともに、連結片９とアウターシェル２との溶接強度を向上できる。 In addition, in the shock absorber D of the present embodiment, the outer shell 2 abuts on the inner peripheral surfaces of the clamping pieces 5 and 6 in the circumferential direction at two points on the proximal side excluding the distal ends. Since the outer shell 2 is supported by the knuckle bracket 4 at three points when it also abuts on the side surface 9a of the piece 9, the welding quality at the welded portions B1 and B2 between the outer shell 2 and the knuckle bracket 4 is further improved. and stability can be realized, and the welding strength between the connecting piece 9 and the outer shell 2 can be improved.
　さらに、本実施の形態の緩衝器Ｄでは、連結片９のアウターシェル２に対向する側面９ａは、湾曲しており、中央部がアウターシェル２の外周に当接する。このように構成された緩衝器Ｄによれば、連結片９をアウターシェル２に溶接すると、連結片９の中央部の溶接品質が向上するので、より一層溶接強度を向上できる。 Furthermore, in the shock absorber D of the present embodiment, the side surface 9a of the connecting piece 9 facing the outer shell 2 is curved, and the central portion abuts the outer periphery of the outer shell 2. According to the shock absorber D configured in this way, when the connecting piece 9 is welded to the outer shell 2, the welding quality of the central portion of the connecting piece 9 is improved, so that the welding strength can be further improved.
　また、挟持片５，６の内周面は、挟持片５，６の内周面における周方向の先端同士の幅Ｗがアウターシェル２の外径よりも大きければ、曲率が変化する湾曲面とされてもよい。なお、挟持片５，６の内周面が曲率中心ｃ１を中心とした半径ｄ１の円を通るように形成される場合には、ナックルブラケット４の寸法管理が容易となる。 The inner peripheral surfaces of the clamping pieces 5 and 6 are curved surfaces whose curvature changes if the width W between the ends of the clamping pieces 5 and 6 in the circumferential direction is larger than the outer diameter of the outer shell 2 . may be If the inner peripheral surfaces of the clamping pieces 5 and 6 are formed so as to pass through a circle with a radius d1 centered on the center of curvature c1, the dimensional control of the knuckle bracket 4 is facilitated.
　また、本実施の形態の緩衝器Ｄは、ナックルブラケット４の挟持片５，６がアウターシェル２の外周を取り巻いていなくとも、ナックルブラケット４をアウターシェル２に強固に固定できるとともに、取付片７，８と連結片９とで箱形を形成しているためナックルブラケット４の強度を高くしてナックルから入力される荷重にも耐え得る。そして、ナックルブラケット４が挟持片５，６、取付片７，８および連結片９とが交わる三面交点を切除する一対の切欠１０，１１とを備えているので、アウターシェル２に強固に固定できるとともに高強度のナックルブラケット４を無理なく成型できる。 Further, in the shock absorber D of the present embodiment, even if the holding pieces 5 and 6 of the knuckle bracket 4 do not surround the outer periphery of the outer shell 2, the knuckle bracket 4 can be firmly fixed to the outer shell 2, and the mounting pieces 7 , 8 and the connecting piece 9 form a box shape, the strength of the knuckle bracket 4 is increased to withstand the load input from the knuckle. Since the knuckle bracket 4 is provided with a pair of cutouts 10, 11 cut at the intersection of the clamping pieces 5, 6, the mounting pieces 7, 8 and the connecting piece 9, it can be firmly fixed to the outer shell 2. At the same time, a high-strength knuckle bracket 4 can be molded without difficulty.
　そして、ナックルブラケット４は、従来のナックルブラケットのようにアウターシェル２を取り巻く抱持部を備えていないので、従来のナックルブラケットと比較して小型になるため、製造に必要な材料が少なくて済み、重量も軽量化される。 Since the knuckle bracket 4 does not have a holding portion surrounding the outer shell 2 like the conventional knuckle bracket, the knuckle bracket 4 is smaller than the conventional knuckle bracket and requires less material for manufacturing. , the weight is also reduced.
　以上より、本実施の形態の緩衝器Ｄによれば、小型軽量なナックルブラケット４の利用が可能となるので、ナックルブラケット４の製造に関して材料歩留まりが改善されるため、緩衝器Ｄの製造に係るコストと緩衝器Ｄの全体の重量を低減できるのである。 As described above, according to the shock absorber D of the present embodiment, it is possible to use the knuckle bracket 4 that is small and light. The cost and overall weight of the buffer D can be reduced.
　また、本実施の形態の緩衝器Ｄでは、切欠１０，１１が矩形であって角部にＲ面形状に面取りが施されているので、切欠１０，１１を設けることによってナックルブラケット４にナックルから荷重が入力される際の応力集中を緩和できる。 In addition, in the shock absorber D of the present embodiment, the cutouts 10 and 11 are rectangular and the corners are chamfered in an R-shape. Stress concentration can be alleviated when a load is input.
　なお、切欠１０，１１の幅寸法および長さ寸法については、前記三面交点を切除できれば任意に設計できるが、ナックルブラケット４の強度の著しい低下を招かず、図６（ａ）に示したナックルブラケット４を展開した形状の平板を打ち抜く金型寿命および保全性を考慮して設計されるとよい。 The width and length of the cutouts 10 and 11 can be arbitrarily designed as long as the three-sided intersection can be removed. It should be designed in consideration of the life and maintainability of the die for punching a flat plate with the shape of 4 developed.
　なお、ナックルブラケット４の取付片７，８および連結片９の形状および寸法は、前述した効果を失わない限りにおいてアウターシェル２の外径、車両のナックルの形状等に応じて適宜設計変更できる。また、挟持片５，６の周方向の先端は、アウターシェル２への溶接に支障が無ければアウターシェル２の半分を超えて反取付片側へ延びていても突出させることも可能であるが、挟持片５，６の重量増加を招くとともにアウターシェル２を側方から挟持片５，６内に挿入できなくなるので、挟持片５，６の周方向の反取付片側端となる先端がアウターシェル２の軸線方向から見てアウターシェル２の半分を超えないようにする方が好ましい。また、挟持片５，６の周方向の反取付片側端となる先端がアウターシェル２の軸線方向から見てアウターシェル２の半分を超えないようにすることで、ナックルブラケット４の材料歩留まりを高くできる利点もある。なお、挟持片５，６の周方向の先端のアウターシェル２の軸方向における長さについては、仕様上要求される接合強度に応じて適宜設計変更できる。 The shape and dimensions of the mounting pieces 7 and 8 and the connecting piece 9 of the knuckle bracket 4 can be appropriately changed in design according to the outer diameter of the outer shell 2, the shape of the knuckle of the vehicle, etc., as long as the above effects are not lost. Moreover, if the ends of the clamping pieces 5 and 6 in the circumferential direction do not interfere with welding to the outer shell 2, it is possible to protrude beyond the half of the outer shell 2 and extend to the side opposite to the mounting piece. This increases the weight of the clamping pieces 5 and 6 and makes it impossible to insert the outer shell 2 into the clamping pieces 5 and 6 from the side. It is preferable not to exceed half of the outer shell 2 when viewed in the axial direction. In addition, by not allowing the ends of the clamping pieces 5 and 6 on the opposite side of the mounting pieces in the circumferential direction to exceed half of the outer shell 2 when viewed from the axial direction of the outer shell 2, the material yield of the knuckle bracket 4 can be increased. There are also advantages. The axial length of the circumferential ends of the clamping pieces 5 and 6 in the axial direction of the outer shell 2 can be appropriately changed in design according to the joint strength required by the specifications.
　また、挟持片５，６の内周面は、曲率が変化する湾曲面とされてもよい。さらに、アウターシェル２を各挟持片５，６の内周面の基端側に当接させることが可能であれば、その限りにおいて挟持片５，６の内周面の形状は、任意に設計変更できる。 Also, the inner peripheral surfaces of the clamping pieces 5 and 6 may be curved surfaces with varying curvatures. Furthermore, as long as the outer shell 2 can be brought into contact with the proximal end side of the inner peripheral surfaces of the clamping pieces 5 and 6, the shape of the inner peripheral surfaces of the clamping pieces 5 and 6 can be arbitrarily designed. can be changed.
　以上、本発明の好ましい実施の形態を詳細に説明したが、特許請求の範囲から逸脱しない限り、改造、変形、および変更が可能である。 Although the preferred embodiments of the present invention have been described in detail above, modifications, variations, and changes are possible without departing from the scope of the claims.
１・・・緩衝器本体、２・・・アウターシェル、３・・・ロッド、４・・・ナックルブラケット、５，６・・・挟持片、７，８・・・取付片、９・・・連結片、９ａ・・・側面、ａ１，ａ２・・・接触点、ｃ１・・・挟持片の内周面の曲率中心、ｃ２・・・連結片の側面の曲率中心、Ｄ・・・緩衝器、ｄ１・・・挟持片の内周面および連結片の側面の曲率半径、ｄ２・・・アウターシェルの半径、Ｏ・・・アウターシェルの半径の中心、Ｓ・・・直線 DESCRIPTION OF SYMBOLS 1... buffer body, 2... outer shell, 3... rod, 4... knuckle bracket, 5, 6... clamping piece, 7, 8... mounting piece, 9... Connection piece 9a Side surface a1, a2 Contact point c1 Center of curvature of inner peripheral surface of clamping piece c2 Center of curvature of side surface of connection piece D Shock absorber , d1 .

Claims (5)

  1. 　緩衝器であって、
    　円筒状のアウターシェルと、前記アウターシェル内に移動自在に挿入されるロッドとを有する緩衝器本体と、
    　前記アウターシェルの下端外周に取り付けられるナックルブラケットとを備え、
    　前記ナックルブラケットは、
    　前記アウターシェルの外周に沿って湾曲するとともに前記アウターシェルを挟持する一対の挟持片と、
    　前記各挟持片の周方向の端部からそれぞれ前記アウターシェルの径方向へ延びて互いに対向する一対の取付片と、
    　前記取付片の端同士を連結する連結片とを有し、
    　前記各挟持片の内周面の周方向の先端よりも基端側が前記アウターシェルの外周に当接する
    　緩衝器。     a buffer,
    a shock absorber body having a cylindrical outer shell and a rod movably inserted into the outer shell;
    a knuckle bracket attached to the outer periphery of the lower end of the outer shell,
    The knuckle bracket is
    a pair of clamping pieces curved along the outer periphery of the outer shell and clamping the outer shell;
    a pair of mounting pieces extending in the radial direction of the outer shell from the circumferential ends of the holding pieces and facing each other;
    a connecting piece that connects the ends of the mounting pieces,
    A shock absorber in which a proximal end side of the inner peripheral surface of each of the clamping pieces contacts the outer periphery of the outer shell rather than the distal end in the circumferential direction.
  2. 　請求項１に記載の緩衝器であって、
    　前記各挟持片の内周面から前記アウターシェルまでの距離は、前記各挟持片の内周面と前記アウターシェルとの接触点から前記各挟持片の先端側へ向かうほど広くなる
    　緩衝器。     The buffer according to claim 1,
    A distance from the inner peripheral surface of each clamping piece to the outer shell becomes wider toward the tip side of each clamping piece from a contact point between the inner peripheral surface of each clamping piece and the outer shell.
  3. 　請求項１または２に記載の緩衝器であって、
    　前記各挟持片の内周面の曲率半径を前記アウターシェルの外周の半径よりも大きくした
    　緩衝器。     The shock absorber according to claim 1 or 2,
    A shock absorber in which the radius of curvature of the inner peripheral surface of each clamping piece is larger than the radius of the outer periphery of the outer shell.
  4. 　請求項１に記載の緩衝器であって、
    　前記連結片の前記アウターシェルに対向する側面は、前記アウターシェルの外周に当接する
    　緩衝器。     The buffer according to claim 1,
    A side surface of the connecting piece facing the outer shell abuts against an outer circumference of the outer shell.
  5. 　請求項１に記載の緩衝器であって、
    　前記連結片の前記アウターシェルに対向する側面は、湾曲しており、中央部を前記アウターシェルの外周に当接させる
    　緩衝器。     The buffer according to claim 1,
    A side surface of the connecting piece facing the outer shell is curved, and a central portion of the connecting piece is brought into contact with the outer periphery of the outer shell.
PCT/JP2022/043111 2021-12-20 2022-11-22 Shock absorber WO2023120002A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-206238 2021-12-20
JP2021206238A JP7340000B2 (en) 2021-12-20 2021-12-20 buffer

Publications (1)

Publication Number Publication Date
WO2023120002A1 true WO2023120002A1 (en) 2023-06-29

Family

ID=86902269

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/043111 WO2023120002A1 (en) 2021-12-20 2022-11-22 Shock absorber

Country Status (2)

Country Link
JP (1) JP7340000B2 (en)
WO (1) WO2023120002A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0216808U (en) * 1988-07-20 1990-02-02
JPH04321807A (en) * 1991-04-20 1992-11-11 Tokico Ltd Cylindrical container fitting bracket
JPH11257411A (en) * 1998-03-16 1999-09-21 Unisia Jecs Corp Fixing bracket construction of hydraulic shock absorber
JP2002130360A (en) * 2000-10-23 2002-05-09 Showa Corp Knuckle bracket structure for hydraulic shock absorber
JP2022083481A (en) * 2020-11-25 2022-06-06 Ｋｙｂ株式会社 Damper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0216808U (en) * 1988-07-20 1990-02-02
JPH04321807A (en) * 1991-04-20 1992-11-11 Tokico Ltd Cylindrical container fitting bracket
JPH11257411A (en) * 1998-03-16 1999-09-21 Unisia Jecs Corp Fixing bracket construction of hydraulic shock absorber
JP2002130360A (en) * 2000-10-23 2002-05-09 Showa Corp Knuckle bracket structure for hydraulic shock absorber
JP2022083481A (en) * 2020-11-25 2022-06-06 Ｋｙｂ株式会社 Damper

Also Published As

Publication number Publication date
JP2023091474A (en) 2023-06-30
JP7340000B2 (en) 2023-09-06

Similar Documents

Publication Publication Date Title
US8511698B2 (en) Suspension system for a vehicle
JP2019506328A (en) Hybrid suspension arm for vehicle and manufacturing method thereof
JP2009511348A (en) Stabilizer bar
JP2008032121A (en) Manufacturing method for cylindrical vibration control device and mounting structural body provided with cylindrical vibration control device
JP5111121B2 (en) Suspension structure
JP6418980B2 (en) Link bracket
WO2023120002A1 (en) Shock absorber
WO2023120001A1 (en) Damper
JP5959918B2 (en) Bracket and anti-vibration connecting rod
JP3433772B2 (en) Bottom structure of vehicle shock absorber and method of forming the same
CN111070987A (en) Damper strut made of two half-shells
JP2001182772A (en) Inverted-type hydraulic shock absorber
JP2005188648A (en) Knuckle bracket structure for hydraulic shock absorber
JP4589775B2 (en) Suspension rod and manufacturing method thereof
JP4695458B2 (en) Strut type shock absorber
JP7177970B2 (en) buffer
JP4200869B2 (en) A-type suspension arm for vehicles
JP2006347370A (en) Suspension bush
JP2004299663A (en) Suspension arm, forged suspension member, and forging die
JP7481889B2 (en) Shock absorber
CN218197794U (en) Automobile rear suspension pull rod
JP2007147038A (en) Cylinder device
JP7164871B2 (en) automotive cross member
DE102009027735A1 (en) Two-point suspension arm for use in e.g. chassis, of motor vehicle, has connecting region comprising recess and projection piece that is fixed in recess by electromagnetic deformation of external boundary regions of recess
JP6956596B2 (en) Cylinder device and manufacturing method of cylinder device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22910720

Country of ref document: EP

Kind code of ref document: A1